Expression of the Wnt antagonist DKK3 is frequently suppressed in sporadic epithelial ovarian cancer.

Abstract:

PURPOSE:The Wnt pathway plays an important role in embryonic development, and defects in this pathway have been implicated in the tumorigenesis. The Dickkopf 3 (DKK3) is a putative Wnt signaling inhibitor that is frequently inactivated in human cancers. However, the expression of DKK3 in ovarian cancer remains unknown. METHODS:We investigated the expression of DKK3 in silico using the Digital Differential Display. DKK3 mRNA expression was also analyzed by real-time RT-PCR in ovarian carcinomas and normal ovarian tissues. DKK3 protein expression was determined by immunohistochemistry in the same ovarian carcinomas and normal ovarian tissues. RESULTS:A significantly reduced expression of DKK3 (P < 0.05) was found after comparison of normal ovary- and tumor-derived libraries in the Cancer Genome Anatomy Project (CGAP). DKK3 mRNA expression was reduced in 63% (35 of 56) of tumors compared with normal ovarian samples (P < 0.02). Analysis of 13 matched pairs of ovarian carcinomas and adjacent normal tissues showed significant transcriptional downregulation of DKK3 (>twofold) in 9 paired carcinomas (69%). Loss or weak membranous expression of DKK3 protein was observed in 66% of ovarian cancers (37 of 56) including all tumors with low transcriptional level of DKK3 gene analyzed by real-time PCR. CONCLUSIONS:To our best knowledge, this is the first time to demonstrate altered expression of DKK3 in ovarian cancer. The latter could be a relevant mechanism for the activation of the Wnt pathway in the carcinogenesis of ovarian cancer but additional studies are required to elucidate the function of DKK3 silencing in ovarian carcinogenesis.

authors

You A,Fokas E,Wang LF,He H,Kleb B,Niederacher D,Engenhart-Cabillic R,An HX

doi

10.1007/s00432-010-0916-6

subject

Has Abstract

pub_date

2011-04-01 00:00:00

pages

621-7

issue

4

eissn

0171-5216

issn

1432-1335

journal_volume

137

pub_type

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